Petite Burberry Trench - Where to get it?

Nordstrom online used to have some of the trenches in petites - but I haven't looked lately.

Or perhaps calll all the Nordstrom's you can and see if anyone has it.

I found that the classic trench with removable liner ran a size small for me - have you tried the 2P. perhaps a 4P would fit?
 
FWIW, My SA at Burberry has told me that alterations are included in the cost of the coat so if worst came to worst, I would think you could always have it altered to fit you perfectly even if it wasn't a P. Good luck! I hope you find it.